公开(公告)号：US12088215B2

公开(公告)日：2024-09-10

申请号：US18634713

申请日：2024-04-12

Applicant: SOUTHEAST UNIVERSITY

Inventor： Huafeng Xiao ,  Xiaobiao Wang

IPC: H02M7/487 ,  H02M1/00 ,  H02M1/088 ,  H02M7/5387

CPC classification number: H02M7/487 ,  H02M1/0054 ,  H02M1/088 ,  H02M7/5387

Abstract: Disclosed are a modulation strategy suitable for balancing losses of power switches in a bridge arm of a neutral point clamped three level inverter and an implementation method. The modulation strategy includes that an operation type of an inverter is determined and a corresponding modulation style is selected on the basis of a power factor (PF) angle; a corresponding modulation interval is selected according to the modulation style; and drive signals for various power switches are outputted, to balance switching losses of inner and outer sides of a bridge arm. The modulation strategy of the present disclosure enables the rational utilization of freewheeling paths to achieve a balanced distribution of losses between the inner and outer power switches of the inverter bridge within the entire PF range, thereby prolonging the service life of power electronic devices.

公开(公告)号：US20240275303A1

公开(公告)日：2024-08-15

申请号：US18634713

申请日：2024-04-12

Applicant: SOUTHEAST UNIVERSITY

Inventor： Huafeng Xiao ,  Xiaobiao Wang

IPC: H02M7/487 ,  H02M1/00 ,  H02M1/088 ,  H02M7/5387

CPC classification number: H02M7/487 ,  H02M1/0054 ,  H02M1/088 ,  H02M7/5387

Abstract: Disclosed are a modulation strategy suitable for balancing losses of power switches in a bridge arm of a neutral point clamped three level inverter and an implementation method. The modulation strategy includes that an operation type of an inverter is determined and a corresponding modulation style is selected on the basis of a power factor (PF) angle; a corresponding modulation interval is selected according to the modulation style; and drive signals for various power switches are outputted, to balance switching losses of inner and outer sides of a bridge arm. The modulation strategy of the present disclosure enables the rational utilization of freewheeling paths to achieve a balanced distribution of losses between the inner and outer power switches of the inverter bridge within the entire PF range, thereby prolonging the service life of power electronic devices.

公开(公告)号：US11128144B2

公开(公告)日：2021-09-21

申请号：US16627363

申请日：2018-10-17

Applicant: SOUTHEAST UNIVERSITY

Inventor： Huafeng Xiao ,  Zheng Wang ,  Ming Cheng

IPC: H02J3/46 ,  H02J13/00 ,  H02M7/49 ,  H02M7/48

Abstract: A grid access current control method without current sensor applicable to a grid-connected inverter relates to a system including a main circuit of the grid-connected inverter and a control circuit of the grid-connected inverter. The control circuit of the grid-connected inverter includes a grid access current open-loop control module and a PWM generation module; the grid access current open-loop control module includes a first proportional regulator, a second proportional regulator, a delayer, and an adder; input ends of the first proportional regulator and the second proportional regulator each are led out as an input end of a grid access current reference signal; and an output end of the first proportional regulator is connected to an input end of the adder; an output end of the second proportional regulator is connected to an input end of the delayer.